I have added a choice to a card layout and added the card layout to the center of the Frame. The frame size is 3/4th of the screen size. I am clicking on the choice and expecting the drop-down to overlap the frame. But drop-down does not appear and looks like it is actually appearing somewhere outside the screen. When I move the frame slightly towards Right bottom corner of the screen, drop-down appears on the top-left corner of the screen when clicking the choice.

This is reproducible only on Mustang and not reproducible on Tiger with XToolkit. This is not reproducible on Motif with Tiger as well as Mustang. Hence it is a regression introduced in XToolkit in Mustang.

I have attached a sample test. Execute the sample test on SolSparc10-JDS. A frame would appear with a Choice in the center. Click on the choice. If the drop-down does not appear anywhere, bug is reproduced.